Rateurs a vaporisation instantane



(No Model.)

L. SERPOLLET. Y TUBE FOR STEAM GENERATORS.

N0.'591,298. Patented Oct. 5,1897.

flyi jy UNITED STATES PATENT O EIcE.

LEoN sERPoLpET, OF PARIS, FRANCE, ASSIGNOR To LA soorErE DES GENE- RATEURS A VAPORISATION INSTANTANEE, sYsTEME LEoN SERPOLLET,)

OF FRANCE.

TUBE FOR STEAM-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 591,298, dated October 5, 1897. Application filed June 26, 1897. Serial No. 642,503. (No model.) Patented in France January 30, 1897, No. 263,588.

To all whom it may concern:

Be it known that I, LEON SERPOLLET, of Paris, Republic of France, have invented a new and useful Improvement in Tubes for Steam-Generators, which is fully set forth in the following specification, and for which I have obtained French Patent No. 263,588, dated January 30, 1897.v

This invention relates to improvements in the construction of vaporizing-tubes of quasicapillary internal section and intended to constitute an instantaneous steam-generator or part of such a generator; and it has for objectand for result to render such vaporizing-tubes stronger while Very much lighter than usual and at the same time to render their manufacture more simple and their shape more regular and more suitable for utilizing the action of the heat given off by the furnace, irrespective of the nature of the said furnaoethat is to say, whatever may be the system of heating emp1oyedand irrespective of the regularity or the intermittency of the heating. The improvements consist, after having obtained a flat tube of the desired length and section, the said section being of the plane shape indicated at'A in Figure 1 of the accompanying drawings, in filling the said tube with dry fine sand, and then while the sand is confined in twisting the said tube about its longitudinal axis, as shown at B, in such a manner that the ends of the plane section forming the longitudinal edges of the tube shall assume the form and direction of two parallel helices of greater or less pitch, as shown in Fig. 2. This figure shows a short length of the new tube ending at one side of the figure in a screw-threaded tubular unionpiece 0 for engagement with a union-nut, the oblique section taken from the opposite side showing that the helical arrangement will also be assumed by the approximately capillary internal space.

The tube thus formed by longitudinal tor sion may be left straight, or it may be coiled in the form of a spiral arranged in a single plane, or it may be coiled to form two or more spirals or stages wound in the same direction arranged side by side and connected at the center, as shown in front and side elevation in Figs. 3 and 4, respectively, or it may be bent in zigzag fashion into the form of a fiat serpentine coil of several convolutions or branches, as shown in front elevation in Fig. 5, each end terminating in a flanged union or, as shown in the said figure, in a screw-threaded union 0, similar to that shown in Fig. 2 and suitable for engagement with a union-nut E, the two unions, one for the entrance of the water or steam and the other for the exit thereof, being situated on the same side, as shown in full lines in Fig. 5, or one on one side and the other on the opposite side, as

shown in full and dotted lines, or at another place. I

Several tubes coiled in a spiral manner or bent into the shape of flat serpentine coils may be arranged above one another, or coupled together side by side in such a manner and the other for the outlet, are placed side by side they are or may be connected together by a collar F, whereby all deformation caused by the pressure which the steam may acquire inside the tube is rendered impossible. The said end portions of the tube may be twisted like the remainder of the tube or be left cylindrical, as shown.

The great resistance olfered to the internal pressure of the steam by the new form of the vaporizing-tube allows of making the tube with very thin walls, so as to produce a light vaporizing apparatus, while rendering it at the same time suitable for all intermittent heating of suitable intensity, especially for heating effected by means of burners fed with petroleum or any other combustible liquid.

Having now particularly described and ascertained the nature of the said invention and In testimony whereof I have signed this in What manner the same is to be performed, specification in the presence of two subscrib- 10 I declare that What I claim ising witnesses.

A steam-boiler tube flattened and havin an approximately ca iillary internal space? LEON SERPOLLET' said tube being twisted so that its longitudi- Witnesses: nal edges assume the form of two parallel heli- EDWARD BEUGUIOT, ces, substantially as described. l EDWARD P. MACLEAN. 

